Mass Transfer

321.Mechanism of moisture removal in case of freeze drying of food stuff is by

1. Evaporation
2. Sublimation
3. Dehydration
4. Adsorption

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322.Milk is dried usually in a _________ dryer.

1. Freeze
2. Spray
3. Tray
4. Rotary

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323.Minimum possible diameter of a packed column is decided mainly by the

1. Flooding
2. Gas viscosity
3. Liquid density
4. Liquid hold up

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324.Minimum reflux ratio in a distillation column results in

1. Optimum number of trays
2. Minimum reboiler size
3. Maximum condenser size
4. Minimum number of trays

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325.Moisture contained by a substance in excess of the equilibrium moisture is called the _________ moisture.

1. Unbound
2. Free
3. Critical
4. Bound

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326.Moisture content of a substance when at equilibrium with a given partial pressure of the vapour is called the _________ moisture.

1. Free
2. Unbound
3. Equilibrium
4. Bound

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327.Moisture in a solid exerting an equilibrium vapour pressure equal to that of the pure liquid at the same temperature is called the _________ moisture.

1. Unbound
2. Critical
3. Free
4. Bound

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328.Moisture in a substance exerting an equilibrium vapour pressure less than that of pure liquid at the same temperature is called the _________ moisture.

1. Bound
2. Unbound
3. Critical
4. None of these

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329.Molarity is defined as the number of gm moles of solute per _________ of solvent.

1. Litre
2. kg
3. gm
4. c.c

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330.Molecular diffusion is caused by the

1. Transfer of molecules from low concentration to high concentration region
2. Thermal energy of the molecules
3. Activation energy of the molecules
4. Potential energy of the molecules

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